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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef1f02ee11c45a598bdd92e47968fc7d4a40b4f9a1638e9c4239cc6ea41aa94' 
  AND token = 'qAbxnr34nOeZckts6dU8+RE2uYuG00Vho7UHcx9rLOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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