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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355d16bd4d45c5ac12f2d9c49ab3e2a3e82c34aed2b63bb70250abd4df1eff29' 
  AND token = 'OiKWrRjv+zykvbfkiJguqveiuTMtLjBvI5FdUEfXv7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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