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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d8e813601499acaf658fb95fb139cf4d044629e4ca4e567ca80883771cc2d6' 
  AND token = 'cRtBVhU3hTLwJvi5QAMifkoanXwfSKHT5tv5REKuRXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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