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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a91eaff5a300c152f2054a7ebe4ab7ebd416f49a1a0215de373ba6d893c320' 
  AND token = 'GpmU206f0h49+ET8QrKC7PvT1X1ubjgWntI9Tm5JmB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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