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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b9aff1d8d03a588e884743559b6e9c4584c8ec3fa72623e0e64d8b77a78515' 
  AND token = 'ZHN2BdCQkuliPY7vAt0S0mG1T/DGDokYpD8OZWJHe1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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