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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2177245f0327e6a77c8a639cfa071c54ee24740dcb1184bff2c412863b9977fa' 
  AND token = '94Noqd7TolBE5/mH39lQ1HFKl9fzfMuJdOu2VndkKss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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