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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e5a203ba8fc8a4a82042b7536e0282061f8811f9a1037ad37c3b52fc22107b' 
  AND token = 'XJPyD+IXj8Xyd11umg2WR8C+yjb280HoFT2NPLkKSW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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