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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576233d3635cec5b01248c4f445c134f4e9f0c9f560996f2ff4d2aec70cc851f' 
  AND token = '7CG/bdveJ1zybZWyOeiBFdvHkxJdyjHw9t69X75AXoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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