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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fb3dfaa75f7f44931360d3d55ab80e1975f791dbf6b64f907cd123779c5d6b' 
  AND token = 'AOoLL9C1Hje+6gaacN0NiLPet09doyEVZPyw4TMAHT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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