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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5d2fe166cb0ff1d3abf294e45ad48b6a7c1d50883df0c767c45aef6e98fa2b' 
  AND token = 'rUlxlZ39fQck86w5DLqBDOE/35Bu2H8GFyE6pFRjtpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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