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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7e90fcbffdff86412f63a7a5d68063401ac9df37e75ca90123583876f538bc' 
  AND token = 'ORe7d8P931wRFFz82hCEjS2HPGPJt9G4u/QzW59xi0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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