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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37fb9bdee851aab25ca04c37971aaf86ba7f593ddbc9196cf328608af1b63977' 
  AND token = '6ml9IWOoc2yygPAKVFaAySsTRFBxSQk409QDfVue2xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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