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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d32a7b32407f4c5cced0091803929e6aa268d6ae488aef2d7bfee102a34eb6' 
  AND token = 'v/w5NJscP/TSkesvc6NRXQFdKA7Qfm/wyQH3GxXwKXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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