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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab81066bf8be88e842bf2a13f4025deea81000bf88436529e0c5318e78924a6c' 
  AND token = '1zchLlaYuTMKyYV+dVZJbVc/k8m0Qwtrr50Iv5xE1mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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