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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a3c55a0f671a9c9d765bc2aa72c0d6fe10872344907b9ef7f1eb796d6288e5' 
  AND token = 'IKLAvfymQ+W+R89s6U9+kH6FNapQSrBjx1aEUhBQ0b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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