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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c264433df4fe04573be390ff707be5af8fac9d7f08b24221baab4a4a4d2081ae' 
  AND token = 'zWFbn9E/Cdk05qrn0gF7M15F1AqJlulzsW2qqCkUmOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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