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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ff1c49c4486d2835375f9ebc3725c3284abc528f4ba89e12b0cea67c1cebdf' 
  AND token = 'i9cuknLptYhTp8U8P45GJdhx2UwYNHcTMfHB1RYOgss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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