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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8f7fd2e5c83d03ead19c979f8e9ed20a999fdb48a7cda5191e57b18d2b3339' 
  AND token = 'Jfnb90Psi0a4KUx4YuLpYSOjckWtvZOPSm410gr5p2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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