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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e45e3cbe2ba3f8df1921ba231da2c860c0472c9907c4fb9d92229ed1cbc4d7' 
  AND token = 'sNfg4G7f9/Ogm0APzPyx9FEUmQJXYrGW9NryTP13GJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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