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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940da87a658b9a6a957410e29af380ba904caf2fb8f3ccb7151b95117bc8a0d8' 
  AND token = '0NL4llZiyZu2Lz6vCh95A4x+0xFrP67cFGuXKxUGZx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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