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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ffb06ed03e9f75dfc9f6e889988fbe2049a0c592af5b596ccc2e0bc9e55fa6' 
  AND token = 'vO0VOnIs1BpChBGtgR6faNhozl9Qe/7e93j/Scyn5Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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