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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f02a0b4fcfc29730000f0a2ae11103cb2886bd1b8da19b6db6e1af91233d90f' 
  AND token = 'lh5ludUNFfr6EuoWNTNJy/41ZxjV9b5tYDOnjTqQe3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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