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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecac56756152ba46dcd3a16cc6e8f32032e7f9960f0e4617d10926fc327a57a' 
  AND token = '407P14bYjRarW6pT60U/cKJvuaRXJCsLJsja7Kk5l4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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