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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dba8971a181667ee372eb4d8a0eb30d2b314805734d911114d4eba06a886913' 
  AND token = 'HLz7Zt6+7dltyo8NhdS0N+zO01d7xnXMT1QhPXYDvi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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