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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052d1319a0579803d7deb167a543e02596b71329f711b63e5d4eb8c63627d418' 
  AND token = '3RmyEzQhAFaHqK40BlLRsmvfCKFTnXhGvcn5AnKJRyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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