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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf033aa65c0d43b8b7ee84c766f88fe51769af5dc751be11b7ccafc0cc96b230' 
  AND token = 'W7HawhbwPQTSFO/zQGLcqBCBn26G4xq8rDpBfZ9iqSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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