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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c959f9392b7d3b2fde8bae261061404c82b3206a5c6eb7d0331a953501b183b' 
  AND token = '/sCrkP7FsWvwO7b6S7ScVPq3RQoC3A6S7w2lQT44R6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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