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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4c4919dfa2161d82e51cbd8ce5f7efe99ae05b3c210bb3bd7ff11a8983f01c' 
  AND token = 'MerbDgxokG4dA9vQ0xx/TqR9q93yxG6MuLjypjR44hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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