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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d73f8da38ff56febef15ccb8a9d8c95f8e31bbe999a5cbdec86e333d213847d' 
  AND token = 'iXFdrksQFDST85xTArhRgNcTQtv+df3Jvb7Y/kUPrds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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