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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa4c187b778af0ec8b2579e22a6b06f63dae2b9dd07e03db89b852952954da7' 
  AND token = 'jhcCU2JByTT5cIyV4j3WByLsamupwE633loZfPSxndQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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