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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515280476cdac4a40f89089172890dcc9bf6bd25b04dec45292af01e178e45c5' 
  AND token = 'cksE5aTHNBjCBV7gNEixQRmInehrD3y3a9zjmOql4N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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