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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dea3cc4c447f95aa1b0120368bff8924a41bd2137310d97f771feefe9b9ee3f' 
  AND token = 'te2cQ5WpYGvu/f5YnZOY5tMz4vQVLv519nKf1vyYQ0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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