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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae2fa6a8a348725b20b78554317880a9b2e5302ebc46de223ce919784f4d427' 
  AND token = 'llIUuFqmcP9vB1Lu77q4d40qE0xISm8bOxdXZ3TgbzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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