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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5f7b92b0d75cdd1a2a3d21edd97b795217ffa4aeb78f578f2ae5ea4d841c74' 
  AND token = 'oScPL8SvpbkhqEXSGP79IUhUtl8xcS03HTZ41vG4BzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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