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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d92eb74d57e37836e8405c7a844c40f4297d6f586bb0b8ad44f4c0c20297469' 
  AND token = 'n4nBpT9ckfhmzOyrbk1WVwmNMbtut/PMGnJcl29kBXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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