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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99470bedb20bb58b94d9c03cbf39603ca4f6dffad8de0bc32635cef46c40715e' 
  AND token = 'dkXmJd7prh5OWT93Z0sbA1qJIJwvffFrH5ECaVguQKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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