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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9c7a4c825e13cfedcc37202b365b54a57520bebc5b75fc6ca5cd689e47687a' 
  AND token = 'INuaHaZ4Z5ovYZgo+j3OtvTFZZDQVX0RBE+B0+OmF9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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