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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82e443077373c740f4bf163ec4e31145911fec83b33ce99a3d9e50598433e0e' 
  AND token = 'F/i5Rost1iCN6QuV9T9D+4N+oMocaEnzkcwN+L5Rcf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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