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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcd993d9798a6e9f464a5afd43a8636ea13f0969a60d196615479f853bf01cd' 
  AND token = 'UMMfO/nlgeczlHZKFutDoa89HCHru7CvpJDBYk7CDW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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