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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbccf68914ca3bfe6ad1cff8bf96bbd5364e75e5bee058eb2cbd1479fac992e0' 
  AND token = 'n6i29MkFLb/T96oOl00oaO8IMuzdTwITW/pXjlQAnnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}