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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb353b4612ce8a701f5fb2beb078fd4028c9ba870e9f29f50abc649d7c989ebc' 
  AND token = '3BRtuV3pIGTJSAx+O4Cqzyh4mo0qQ7dnfmREKic8dK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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