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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b005b134a46f9199c5d8932f9963e1a56e638c73c4a8e7b1bd28a40f763f38' 
  AND token = 'pFrlaGINGdP4AuqcMon/69g0xEaYq84JnUv+he9MWA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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