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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690f9f0f36335c160b13266411178b8b7da9b5d3f10b7f4608fa8d048c9ed1a5' 
  AND token = 'Tk89W6zVCxPjH22ZxYkm7E2n95io9fTSxdavjYNMiPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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