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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77504556c32cbd8fbdbfbc827b988306b52e63d41a4c3ecb7b213763ac3462d8' 
  AND token = 'JKCprzNTPaFAzy9SkPTVEhurh5HEoNLuxqdSoHenhjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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