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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac6ef4b69f15b77846014d0b91d0241eeb28bb255b8150b0c222e984858e575' 
  AND token = '36OtKa5b8R/apbt4TxXUapRXyT0bfTdlE/vr6DAXgkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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