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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c4e75f87b60eaec336782f93b2e5e2c2aa87a8b1a0ccbd458af4ccb62a7552' 
  AND token = '2kfkbV6ybWpZXQjarqQdolPYKZr4i8oPcbziEFFCsEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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