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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5e4f7040aa00e76d22d3d0bbde2566ee9945ac658502e82ddfa7aec609ff64' 
  AND token = 'LleV0QvbkRSAEVgOOSSC7e5yk+9nvd3hlffHyvFJhMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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