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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b3e8e578e802e024ac778dd1959c964f7a97f029fdfc944bb8e60084997878' 
  AND token = 'jU/WLt482a5fdBzGKPJ7bSSV7OSeytjp5L8Ttqki8NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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