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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999587bfb8d6b15228dc75d31999361ad62b5c2d10c7b6fc3ee0a3ab2ecd8f35' 
  AND token = 'W7DgpAzryw23DPtWP3jcEhGmz2OCET6Ub5uz0nghnw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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