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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb3930c8d4d9473c69731fc1aed3f42b7aff0bbc6342cc5cd6235d54c0778a3' 
  AND token = '1WmgUlnImP5KcEe7gV75Pza3++0bwDm16r/N96M2Ldc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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