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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9172af8219057620752472ba1d2b6dcff1e87859454ce97a2d1c83283ab8fe3e' 
  AND token = 'zgJAJAe1XNObao2Q+1md29uZgT5H37Pt96g2Nn+5jak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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